Our current research program addresses watershed management using a combination of experimental, theoretical and numerical modeling across a wide range of temporal and spatial scales.  Ultimate objective of the research program is to promote sound watershed management practices and provide a solid foundation on which to build sustainable watershed and water resources management in Hawaii.  Specific areas include:

• Evaluate current water flow and nutrient management practices.
• Develop site-specific water and nutrient management practices, using precision agriculture, real-time sensing technology, geographic information system and ground positioning system.
• Optimizing irrigation and fertilizer applications using state of the art soil water and solute monitoring techniques, i.e. capacitance probes, soil solution sampling devices.
• Computer numerical models for predicting nutrient fate and transport in soils.
• Modeling to develop and test alternative nitrogen and water management practices for citrus in deep sandy soils.  Basic field research on water flow, solute transport and limitation of soil moisture monitoring devices.
• Measuring and estimating soil physical and hydraulic properties, solute transport parameters used in modeling water flow and the fate and movement of agrochemicals in soil.
• Spatial and temporal variability of soil physical and soil chemical properties in field soils. This involves applying classical statistics and geostatistical techniques to describe the natural variation of soil as well as understanding the effect of spatial variability of soil parameters on transport.
• Field testing, evaluation and simulation modeling for agricultural non-point sources pollution models. This research area focuses on the use of simulation models agricultural water quality models including (HYDRUS2D, LEACHM, and VS2DT).